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Simplifying -28 + -2r = -4(7 + -3r) -28 + -2r = (7 * -4 + -3r * -4) -28 + -2r = (-28 + 12r) Add '28' to each side of the equation. -28 + 28 + -2r = -28 + 28 + 12r Combine like terms: -28 + 28 = 0 0 + -2r = -28 + 28 + 12r -2r = -28 + 28 + 12r Combine like terms: -28 + 28 = 0 -2r = 0 + 12r -2r = 12r Solving -2r = 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. -2r + -12r = 12r + -12r Combine like terms: -2r + -12r = -14r -14r = 12r + -12r Combine like terms: 12r + -12r = 0 -14r = 0 Divide each side by '-14'. r = 0 Simplifying r = 0
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